Automatic stopping device for elevators.



10 MODEL.

AUTOMATIC STOPP PATENTED JULY 7, 1903. J. KOBOS.

ING DEVICE FOR ELEVATORS.

APPLICATION FILED APR. 13, 1903 2 SHEETS-SHEET 1.

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m: mums FETERS co. more-Limo, WASNINGIQN 11c No. 732,868. I PATENTED JULY 7, 1903.

J. KOBOS.

AUTOMATIC STOPPING DEVICE FOR ELEVATORS.

I APPLIOATION FILED APR. 1a, 1903.

H0 MODEL. 2 SHEETS-SHEET 2.

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No."?32 868. H C

UNITED STATES Patented July 7, 1903.

ATENT FFICE.

JACOB KOBOS, OF BRIDGEPORT, CONNECTICUT.

AUTOMAT IC STOPPING.DEVICE FOR ELEVATORS.

SPECIFICATION forming part of Letters Patent No. 732,868, dated July 7, 1903.

Application filed April 13, 1903.

To all whom it may concern.-

. Be it known that I, JACOB KOBOS, a citizen of the United States, residing at Bridgeport, county'ofFairfield, State of Connecticut, have invented a new and useful Automatic Stopping Device for Elevators, of which the following is a. specification.

My'invention has for its object to provide a stopping device which shall be eifective to stop an elevator in the event of breakage of the lifting-rope or any of the lifting mechanism, but without danger of sudden shock or jar, whichshall be simple in construction and always-ready to operate with either a light or heavy load, constructed without springs,

in which liability to get out of repair under the ordinary orextraordinary conditions of use is practically eliminated, and in which certainty of operation shall be secured by the conjoint use of friction-stops and positive stops acting successively.

With these and other objects in view the invention consists in certain constructions and in certain parts,improvements,and combinations,which will be hereinafter described and then specifically pointed outin the claims hereunto appended.

In the accompanying drawings, forming part ofthis specification, in which like char acters of reference indicate the same parts, Figure 1 is a vertical section of the frame of an elevator embodying 'my novel stopping device, three of the guide-strips being in elevation and two of them partly in section to illustrate the frictional stopping device which is first to act; Fig. 2, an inverted plan view corresponding with Fig. 1, the guide-strips being in cross-section; Fig. 3, a" detail view illustrating the action of one of the grippings levers; Fig. 4, a View similar to Fig. 1, but

at right angles thereto to illustrate the construction of the positive or secondary stopping device, but not its operation; and Fig. 5 is a view similar to Fig. 4, illustrating the operation of the secondary or positive stopping device.

The frame of the elevator consists of a top" piece 10, atop piece 11 at aright angle thereto,

abottom piece l2,corresponding with top piece 10, a bottom piece 13, corresponding with top piece 11, said top pieces and bottom pieces,

respectively, being rigidly secured together,

Serial No. 152,448. (No model.)

two side pieces 14,0pposite to each other and rigidly secured to the ends of top piece 10 and bottom piece12, and two side pieces 15, opposite to each other and rigidly secured to g the ends of top piece 11 and bottom piece 13.

The top pieces are shown as made substantially rectangular and the side and bottom pieces as U-shaped in cross-section. The

special manner in which the top, bottom, and

side pieces are made and secured together is of course not an essential feature of the invention.

. The elevator travels between two guidestrips 16, lying opposite to each other and contiguous to side pieces 14 of the elevatorframe and provided with rigid stop-blocks 18, which pass into side pieces 14, as clearly shown in Fig. 2-that is, the stop-blocks pass between the side walls of the U-shaped side pieces and two guide-strips 17, lying opposite to each other and contiguous to side pieces 15, each of said guide-strips 17 being provided with agroove 19, which is partly covered by a metal strip 20, rigidly secured to the guide-strip, the function of which will presently be fully explained.

Lying within top piece 10, bottom piece 12, and side pieces 14 is a rigid frame 21, which top piece, bottom piece, and side pieces and may have vertical movement independently of the frame of the elevator. The elevator is, in fact, carried by this frame, as is clearly shown in Fig. 4.

22 denotes the lifting-rope, which is attached to an eye 23, whose shank 24 passes through the top of the elevator-frame at the intersection of the top pieces and is rigidly secured to the frame 21, which lies within the elevator-frame.

It will be seen from Fig. 4 that the top of bottom piece 12 of the elevator-frame rests upon the top of the lower strip of frame 21 and top piece 10 of the elevator-frame rests upon the top strip of frame 21, so that in use the entire weight of the elevator and its contents is carried by the frame 21, to which the lifting-rope is attached.

25 denotes looking-dogs, pivoted in the elevator-frame at the intersection of the ends of bottom piece 12 with side pieces 14. These locking-dogs are provided on their inner faces with notches 26, which are engaged by lugs 27 on frame 21 for the purpose of oscillating the locking-dogs and causing them to engage stop-blocks 18 on side pieces 16 should the elevator fall, as clearly shown in Fig. 5 and as will presently be fully explained.

28 denotes levers pivoted, as at 29, in the arms of bottom piece 13 of the elevator-frame. Each of these levers is provided with a head 30 and with a slot 31, which receives one of the strips 20. (See Figs. 2 and 3.) At the inner ends of levers 28 are notches 32, which are engaged by arms 33, extending at right angles to each other from the mid-length of the bottom strip of frame 21.

The side walls of bottom pieces 12 and 13 are shown as braced and supported by rivets or screws passing through sleeves 34.

The operation is as follows: Under the normal conditions of use-that is, with the elevator moving downward at any ordinary rate of speed the normal position of locking-dogs 25 will be as shown in Fig. 4, in which position they easilyclearstop-blocks 18 when the elevator is moving in either direction, and levers 28 will lie in substantially the position indicated by dotted lines in Fig. 3, in which the walls of slots 31 will not engage strips 20, butthe levers will move upward and downward freely without frictional contact wit h the strips. Should the lifting-rope break, however, or any breakage occur in the machinery that would cause the elevator to fall, frame 21 would drop within the elevatorframe. This would necessarily follow the breakage instantly. The first effect would be to set what I term for convenience the primary or frictional stopping devices, which operate as follows The downward movement of arms 33, which are part of frame 21, through the engagement of said arms with notches 32 in levers 28 tilts the inner ends of said levers downward, and

consequently raises the outer ends of said levers from the position shown in dotted lines in Fig. 3 to the position shown in full lines in said figure, which causes the walls of slots 31 to grip strips 20, heads 30 upon the levers being specially constructed to provide strong gripping surfaces upon the strips, which, however, cannot act under the ordinary conditions of use. The action of this primary or frictional stopping device will be obvious from Fig. 3. It will be seen that the lower end of one wall of slots 31 will engage the inner sides of the strip, and the other wall of the slots, thatis at the upper ends of heads 30, will engage the outer sides of the strip, thus giving a double frictional engagement with one of the strips on each side of the elevator. Unless the elevator is heavily loaded this frictional engagement of arms 28 with strips 30 will bring the elevator to a standstill. If so, well and good. It will check the fall in any event without serious shock, and if not entirely stopped by the primary or frictional stopping devices the elevator will be brought to a positive and rigid standstill an. instant later through the engagement of locking-dogs 25 with stop-blocks 18 on side strips 16. These locking-dogs and stop-blocks comprise what I term for convenience a secondary and positive stop for the elevator, said secondary stopping device rendering it impossible for the elevator to drop downward past the first pair of stop-blocks it meets in its descent. These stop-blocks may be placed at such distance apart as to render the stoppage of the elevator within a very few feet of the position it occupied when the breakage occurred a positive certainty.

Having thus described my invention, I claim- 1. The combination with an elevator-frame consisting of top and bottom pieces at right angles to each other and U shaped side pieces rigidly secured to the ends of the top and bottom pieces, of guide-strips contiguous to said side pieces, two opposite guide-strips being provided with stop-blocks which pass into the corresponding side pieces, the other two guide-strips being provided with strips 20, a

frame'21 lying within opposite side pieces and corresponding top and bottom pieces upon which the elevator-frame rests and which is provided with lugs 27, pivoted locking-dogs engaged by said lugs and adapted to engage opposite stop-blocks, levers pivoted in the bottom pieces at right angles to frame 21 and having slots which receive strips 20 and arms extending from frame 21 which engage and operate the levers, so that should the elevator fall, frame 21 would drop within the elevator-frame and cause the walls of the slots in the levers to engage strips 20 to hold the elevator by frictional contact and the locking-dogs would be thrown into position to en'- gage stop-blocks to lock the elevator positively.

2. The combination with an elevator-frame com prising top pieces 11, bottom pieces 13 and U-shaped side pieces 15, of guide-strips 17 having grooves 19 and strips 20, a frame 21 upon which the elevator frame rests and which is provided with arms 33 and levers pivoted in the bottom pieces at right angles to frame 21 which are engaged by arms 33 and are provided with slots to receive strips 20, so that should the elevator fall, frame 21 would drop within the elevator-frame and cause the walls of the slots in the levers to engage strips 20 to hold the elevator by frictional contact.

3. The combination with an elevator-frame comprising top pieces 10, bottom pieces 12 and U-shaped side pieces 14,0f guide-strips16 having stop-blocks 18 which pass within the side pieces, a frame 21 upon which the elevatorframe rests and which is provided with lugs 27 and pivoted locking-dogs engaged by said lugs and adapted to engage opposite stopblocks, so that should the elevator fall, frame 21 would drop within theelevator-frame and throw the locking-dogs into position to engage stop-blocks and lock the elevator against downward movement.

4. The combination with an elevator-frame having U-shaped side pieces 15, of grooved guide-strips having strips 20, a frame 21 upon which the elevator-frame rests, arms extending from said frame and levers pivoted in the elevator-frame which are engaged by said arms and are provided with slots to receive strips 20,substantiallyas shown, for the purpose specified.

5. The combination with an elevator-frame having U-shapedSside pieces 15, of grooved guide-strips having strips 20, a frame 21 within the elevator-frame upon which the latter rests, arms extending from said frame 21 and levers pivoted in the elevator-frame which are engaged by said arms and are provided with slots to receive strips 20 and with heads 30 adapted to engage said strips to stop the elevator by frictional contact should frame 21 drop relatively to the elevator-frame.

6. The combination with an elevator-frame having U-shaped side pieces 15, of grooved guide-strips having strips 20, aframe 21 lying within the elevator-frame and having movement independently thereof, a lifting-rope attached to said frame 21, arms extending from said frame and levers pivoted in the elevatorframe which are engaged by said arms and are provided with slots to receive strips 20, so that should the lifting-ropebreak or run free, the elevator would be stopped by engagement of the walls of the slots with strips 20.

7. The combination with an elevator-frame having U-shaped side pieces 14, of guidestrips having stop-blocks which pass within the side pieces, a frame 21 within the elevator-frame upon which the latter rests and which has vertical movement independently of the elevator-frame and is provided with lugs 27 and pivoted locking-dogs engaged by said lugs and adapted to engage opposite stop-blocks should frame 21 drop within the elevator-frame, thereby locking the elevator against downward movement.

8. The combination with an elevator-frame having U-shaped side pieces 14, of guidestrips having stop-blocks which pass within the side pieces, a frame 21 within the elevator-frame upon which the latter rests and which has vertical movement independently a of the elevator-frame and is provided with lugs 27, a lifting-rope attached to said frame adapted to be thrown into position to engage I opposite stop-blocks and lock the elevator against downward movement should the lifting-rope break or run free.

9. The combination with an ele vator-frame and a frame 21 lying within the elevatorframe upon which the elevator-frame rests but which has vertical movement independently thereof, of grooved side strips having strips 20, levers pivoted in the elevator-frame and having grooves which receive strips 20 and arms extending from frame 21 and engaging the levers, whereby when frame 21 drops relatively to the elevator-frame the levers are tilted and the walls of the slots are caused to engage strips 20, substantially as shown,

for the purpose specified.

10. The combination with an elevatorframe and a frame 21 lying within the elevator-frame upon which the elevatorframe rests, but which has vertical movement independently thereof, of side strips having stop-blocks and pivoted locking-dogs which are engaged by frame 21, and thrown into position to engage stop-blocks on opposite sides of the elevator and stop downward movement of the latter should frame 21 drop relatively to the elevator-frame.

11. The combination with an elevatorframe and a frame 21 lying within the elevator-frame upon which the latter rests but which has vertical movement independently thereof, of grooved side strips lying opposite to each other and having strips 20, other side strips having stop-blocks, levers pivoted in the elevator-frame and having slots which receive strips 20, arms extending from frame.

21 which engage and operate said levers, locking-dogs pivoted in the elevator-frame and lugs upon frame 21 which engage and operate the locking-dogs, so that should frame 21 drop relatively to the elevator frame, downward movement of the elevator would be checked by frictional engagement of the levers with strips 20 and would be positively stopped by engagement of the pivoted locking-dogs with stop-blocks.

In testimony whereof I afiix my signature in presence of two witnesses. t.

JACOB KOBOS. Witnesses:

A. M. WOOSTER, S. W. ATHERTON. 

